| Year | Title | Role | Notes |
| 1916 | Sunshine Dad | Baby | Credited as William DeWolf Hopper Jr. |
| 1936 | The King Steps Out | Soldier | Offscreen credit |
| Murder with Pictures | Photographer | Offscreen credit as DeWolf Hopper |
| The Big Broadcast of 1937 | Ship's Officer | Uncredited |
| Easy to Take | Monitor room man | Offscreen credit as DeWolf Hopper |
| The Accusing Finger | Reporter | Offscreen credit as DeWolf Hopper |
| Beware of Ladies | Reporter | Uncredited |
| 1937 | Larceny on the Air | Announcer | Credited as DeWolf Hopper |
| Join the Marines | Marine | Uncredited |
| Dick Tracy | Dirigible Pilot | Uncredited |
| Public Wedding | Tony Burke | Male lead, opposite Jane Wyman |
| Mr. Dodd Takes the Air | Second production manager | Uncredited |
| The Footloose Heiress | Jack Pierson | |
| Back in Circulation | Pete Edington | Offscreen credit |
| Love Is on the Air | Eddie Gould | |
| Over the Goal | Ken Thomas | Male lead, opposite June Travis |
| The Adventurous Blonde | Matt | |
| 1938 | Daredevil Drivers | Neeley bus driver | Offscreen credit |
| Love, Honor and Behave | Yale tennis player | Offscreen credit |
| Mystery House | Lal Killian | |
| The Patient in Room 18 | Grabshot | Offscreen credit |
| Women Are Like That | Larraby | Offscreen credit |
| 1939 | Stagecoach | Cavalry Sergeant | Offscreen credit |
| Midnight | Flammarions' Party Guest | Uncredited |
| Daughters Courageous | Striped-shirted man at beach | Offscreen credit |
| The Cowboy Quarterback | Handsome Sam | Offscreen credit as DeWolf Hopper |
| The Old Maid | John | Credited as DeWolf Hopper |
| The Angels Wash Their Faces | Photographer | Uncredited |
| Nancy Drew and the Hidden Staircase | Reporter | Offscreen credit as DeWolf Hopper |
| Dust Be My Destiny | Reporter | Uncredited |
| Espionage Agent | Student | Offscreen credit |
| On Your Toes | Ronald – Peggy's Escort | Offscreen credit as DeWolfe Hopper |
| Pride of the Blue Grass | Joe | Credited as DeWolf Hopper |
| On Dress Parade | Soldier Getting Radio Report from H4 | Uncredited |
| The Return of Doctor X | Intern | Credited as DeWolf Hopper |
| A Child Is Born | Intern | Offscreen credit as DeWolfe Hopper |
| Invisible Stripes | Young Man | Offscreen credit as DeWolfe Hopper |
| 1940 | The Fighting 69th | Private Turner | Credited as DeWolf Hopper |
| Calling Philo Vance | Hotel clerk | Offscreen credit as DeWolfe Hopper |
| Castle on the Hudson | Reporter | Offscreen credit as DeWolfe Hopper |
| Virginia City | Lieutenant | Offscreen credit as DeWolfe Hopper |
| 'Til We Meet Again | Man | Uncredited |
| Tear Gas Squad | George | Credited as DeWolf Hopper |
| Flight Angels | Lefty | Credited as DeWolfe Hopper |
| Brother Orchid | Reporter | Offscreen credit as DeWolfe Hopper |
| Gambling on the High Seas | Station operator | Offscreen credit as DeWolfe Hopper |
| The Man Who Talked Too Much | Reporter | Offscreen credit as DeWolfe Hopper |
| Ladies Must Live | Joe Barton | Credited as DeWolf Hopper |
| Money and the Woman | Burns, Bank Depositor | Offscreen credit as DeWolfe Hopper |
